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Journal of Materials Science

, Volume 30, Issue 20, pp 5056–5064 | Cite as

Experimental and theoretical phase diagrams of the iron-rich Fe-Si-Ge ordering system

  • T. Kozakai
  • T. Miyazaki
Article

Abstract

The phase separation in iron-rich Fe-Si-Ge ternary alloys was investigated by means of transmission electron microscopy. The phase separations into A2 and D03 were recognized in several alloys in addition to the phase separation into B2 and D03 which has already been found in Fe-Si and Fe-Ge binary systems. On the basis of TEM observations, isothermal section diagrams are proposed for the iron-rich corner at 823, 873, 923 and 973 K. The A2 + D03 two-phase field exists in a band-shaped region at 823 K. With increase in temperature,the A2 + D03 field gradually shrinks and is eventually replaced at 973 Kwith the B2 + D03 field, which extends from both the Fe-Si and Fe-Ge binary sides. The phase diagrams were well reproduced by the calculations based on the so-called Bragg-Williams-Gorsky approximation, taking account of the chemical and magnetic pair interactions up to the second nearest neighbour. The effects of the magnetism on the equilibria are discussed.

Keywords

Transmission Electron Microscopy Phase Diagram Phase Separation Binary System Material Processing 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    G. Schlatte and G. Inden, Z. Metallkde 66 (1975) 660.Google Scholar
  2. 2.
    H. Warlimont, ibid. 59 (1968) 595.Google Scholar
  3. 3.
    G. Inden and W. Pitsch, ibid. 63 (1972) 253.Google Scholar
  4. 4.
    Idem, ibid. 62 (1971) 627.Google Scholar
  5. 5.
    H. Enoki, K. Ishida and T. Nishizawa, Metal. Trans. 18A (1987) 949.CrossRefGoogle Scholar
  6. 6.
    P.Z. Zhao, T. Kozakai and T. Miyazaki, J. Jpn Inst. Met. 54 (1990) 1056 (in Japanese).CrossRefGoogle Scholar
  7. 7.
    T. Kozakai and T. Miyazaki, in “Proceedings of 1st Japanese International SAMPE Symposium on New Materials and Processes for the Future”, (Yokohama 1989) p.139.Google Scholar
  8. 8.
    T. Kozakai and T. Miyazaki, in “Computer Aided Innovation of New Materials II”, edited by M. Doyama et al., (North-Holland, Amsterdam, 1993) p.767.Google Scholar
  9. 9.
    M. Fukaya, T. Kozakai and T. Miyazaki, J. Jpn Inst. Met. 52 (1988) 369 (in Japanese).CrossRefGoogle Scholar
  10. 10.
    P.Z. Zhao, T. Kozakai and T. Miyazaki, ibid. 54 (1990) 139 (in Japanese).CrossRefGoogle Scholar
  11. 11.
    T. Miyazaki, T. Kozakai and T. Tsuzuki, J. Mater. Sci. 21 (1986) 2557.CrossRefGoogle Scholar
  12. 12.
    M. Fukaya, T. Miyazaki, P.Z. Zhao and T. Kozakai, ibid. 24 (1990) 522.CrossRefGoogle Scholar
  13. 13.
    T. Kozakai and T. Miyazaki, ISI J. Int. 34 (1994) 373.CrossRefGoogle Scholar

Copyright information

© Chapman & Hall 1995

Authors and Affiliations

  • T. Kozakai
    • 1
  • T. Miyazaki
    • 1
  1. 1.Nagoya Institute of TechnologyNagoyaJapan

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